M265LH 1kW Urethane In-Hull Transducer with In-Hull Mounting Kit The M265 is an outstanding in-hull option with 8 internal ceramics and up to 117kHz of total CHIRP range. The in-hull installation eliminates the need to drill any holes in the hull, while accommodating a large range of deadrise angles. The medium-frequency benefits include the ability to identify targets deeper than the high-frequency with benefit of a wider beam angle. The high frequency provides excellent shallow water resolution.